Window cleaning appliance



FIG. 1 is a perspective top, front view of a window cleaning appliance, showing our new design;

FIG. 2 is a perspective bottom, rear view thereof;

FIG. 3 is a front view thereof;

FIG. 4 is a rear view thereof;

FIG. 5 is a left side view thereof, the opposite side being a mirror image thereof;

FIG. 6 is a top view thereof; and,

FIG. 7 is a bottom view thereof.

The broken lines showing portions of the window cleaning appliance in the drawings form no part of the claimed design. 

CLAIM The ornamental design for a window cleaning appliance, as shown and described. 